RING 8U2398 - Caterpillar

System Operation Description:Use this procedure under the following situation:Use this procedure to determine if the following circuits are operating correctly:
Torque limit switch
Ignore brake/clutch switch
Two-speed axle switch
Diagnostic enable switch
PTO Engine RPM Set Speed Input A Switch
PTO Engine RPM Set Speed Input B SwitchThe following background information is related to this procedure:The ECM can use various inputs in a number of ways. The inputs depend on the parameter programming. Certain features are available on several different inputs. The configuration for the switch must match the actual switch installation in order for the switch to function properly.Input 4 (Torque Limit Switch)MAR98 and Newer SoftwareThe torque limit switch provides a way to temporarily protect equipment from damage that is caused by applying too much torque. Torque limiting is typically used during PTO operation. Torque limiting can also be used when the PTO on/off switch is in the OFF position.In order to use torque limiting, the parameter "Torque Limit" must be programmed. The "Torque Limit" parameter is located under the "Dedicated PTO Parameters". The default setting is 2712 N m (2000 lb ft). The "Input # 4" parameter must be programmed to "Torque Limit Switch". If the "Input # 4" parameter is programmed to "None" (default), this feature is not used. OCT01 SoftwareThe parameter "Input # 4" has been replaced by the parameter "Torque Limit Switch". This parameter can be programmed to "J1/P1:7", "J1/P1:23", or "None".Input 5 (Ignore Brake/Clutch Switch)MAR98 and Newer SoftwareThe ignore brake/clutch switch is typically used when the parameter "PTO Configuration" is programmed to "Cab Switches". This configuration requires mobile use of the vehicle during PTO operation. When the ignore brake/clutch switch is on, depressing the brake or the clutch will not disengage PTO operation or a set engine speed. If the "Input # 5" parameter is programmed to "None" (default), this feature is not used. For information on troubleshooting this switch, refer to Troubleshooting, "Ignore Brake/Clutch Switch Circuit - Test".OCT01 SoftwareThe parameter "Input # 5" has been replaced by the parameter "Ignore Brake/Clutch Switch". This parameter can be programmed to "J1/P1:47" or "None".Input 6 (Two-Speed Axle Switch)MAR98 and Newer SoftwareWhen a two-speed axle is used, the change in gear ratios from the main drive axle ratio will alter the calibration of the vehicle speed signal. When the two-speed axle switch is in the ON position, the ECM will automatically adjust the vehicle speed calibration. This will ensure that the ECM driven speedometer and the stored information in the ECM correctly reflect the actual vehicle speed. In order for this feature to function properly, the "Low Speed Range Axle Ratio" and "High Speed Range Axle Ratio" parameters must be programmed. If the "Input # 6" parameter is programmed to "None" (default), this feature is not used.OCT01 SoftwareThe parameter "Input # 6" has been replaced by the parameter "Two-Speed Axle Switch". This parameter can be programmed to "J1/P1:6" or "None".Input 7 (Diagnostic Enable Switch)JUL99 and Newer SoftwareThe diagnostic enable switch is used to prompt diagnostic flash codes on the check engine